#--> first identify your USB disk: fdisk list # --> Example OUTPUT : ' /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk1 1.0 TB disk0s2 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +1.0 TB disk1 Physical Store disk0s2 1: APFS Volume Macintosh HD - Datos 907.8 GB disk1s1 2: APFS Volume Preboot 81.5 MB disk1s2 3: APFS Volume Recovery 526.6 MB disk1s3 4: APFS Volume VM 2.1 GB disk1s4 5: APFS Volume Macintosh HD 11.0 GB disk1s5 /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme *248.7 GB disk2 1: Apple_partition_map 4.1 KB disk2s1 2: Apple_HFS 4.1 MB disk2s2 ' #--> in this example USB stick is disk2 (external, physical): # --> let's blank complete pendrive: sudo dd if=/dev/zero of=/dev/disk2 count=1 bs=4096 # --> let's check again: diskutil list : ' /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk1 1.0 TB disk0s2 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +1.0 TB disk1 Physical Store disk0s2 1: APFS Volume Macintosh HD - Datos 907.8 GB disk1s1 2: APFS Volume Preboot 81.5 MB disk1s2 3: APFS Volume Recovery 526.6 MB disk1s3 4: APFS Volume VM 2.1 GB disk1s4 5: APFS Volume Macintosh HD 11.0 GB disk1s5 /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: *248.7 GB disk2 ' # Then you can run disk utility to initialize / format pendrive.
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